Device for receiving start-stop messages

 

(57) Abstract:

The invention relates to electro - and radio and can be used in wired, radio and radio-relay and meteoric line of communication with feedback and without feedback channel. The technical result is to reduce the likelihood of false positives. This is achieved by introducing a second measuring channel, in which the accumulation of stresses generated by the clock and information signals after non-linear processing and comparison of the total signal level with a threshold, significantly exceeding the threshold of the threshold device. The almost complete absence of false positives with the introduction of the second measuring channel has allowed optimal joint detection and measurement of the delay of the received signal to produce a first threshold is exceeded, the total signal. 3 Il.

The invention relates to electro - and radio and can be used in wired, radium-, radio-relay and meteoric line of communication with feedback or without feedback channel.

A device for receiving start-stop messages containing the serially connected receiver, filter, peak detector, a threshold device the signal, generator, solver, the first key storage device and the second key, and a frequency discriminator, the input connected to the output of the receiver, and the output connected to the signal input of a casting device, and the sensor observation interval, and the second input of the Gating device is connected to the filter output, the control input of the first key is connected to the output of the circuit selecting the maximum value of the signal generator output clock pulses connected to the second input of the storage device, and its second input connected to the output of the sensor observation interval connected with the second input circuit selecting the maximum signal and control input of the second key, the output which is the output device. Such a device is described in the article Kanev z Ledovskikh M. and C. I. "the Transmission of discrete messages over channels with feedback interrupts". Telecommunications, 1970, N 8, PP 6-8.

However, such a device has a low immunity and a greater likelihood of false positives.

Closest to the claimed device is a device for receiving start-stop messages described in the book Varakin L. E. "communication Systems with noise-like signals), Radio and the nick 1, the frequency discriminator 2, filter 3, the threshold device 4, a differentiating cascade 5, the pulse shaper 7, the gate device 8, a scheme of selecting the maximum value signal 18, the clock 9, the crucial device 10, the first key 11, a storage device 12 and the second key 13, and the sensor observation interval 19, and the second input of the Gating device 8 is connected to the output of the filter 3, the control input of the first key 11 is connected to the output of the circuit selecting the maximum value signal 18, the signal input of a casting device 10 is connected to the output of the frequency discriminator 2, the output of clock 10 is connected to the second input of the storage device 12, and its second input connected to the output of the sensor observation interval 19 connected with the second input circuit selecting the maximum signal 18 and control input of the second key 13, the output of which is the output device.

In the pulse shaper 7 is created by a short pulse duration time corresponding to the end of the clock, which is in block 8 is used for Gating (reading level) of the output unit 3. The device 18 each time when applying for its duration nT+ which opens the key 11 and is used for running unit 9.

In start-stop communication systems to a minimum length of pause between messages (observation interval) may substantially exceed their duration, so the receiver should be the optimal search procedure signal time interval of observation. For this purpose, and serves as the device 18, which sequentially in time is determined by the maximum sample signal after filtering and, ultimately, the temporal position of the synchronization signal. In the sensor observation interval in the moment of its end is formed a pulse with the same duration as informational messages. At this time he opens the second key 13, and the leading edge is the start of the block 9 and write in block 18 of the signal with a zero level.

To address this shortcoming in the device containing the serially connected receiver, a frequency discriminator, a filter, a threshold device, a differentiating stage, connected in series shaper pulses, Gating device connected in series generator of clock pulses, a crucial device, the first key, zapominanie entrance of a casting device connected to the output of the frequency discriminator, and the output clock pulses is connected to a second input of the storage device, connected in series introduced a squarer, drive, strobing threshold device, and the pulse counter and the circuit breaker, and the first input chopper circuit connected to the output of the differentiating stage, and the output to the input of the pulse shaper, the second output of which is connected with the second input of the circuit breaker, with the first input clock, and control input of the first key, the output of which is connected to the input of the pulse counter, the output of the pulse counter is connected with the second generator input clock pulses, managing entrance drive, a second input strobing threshold device, the output of which is connected with the control input of the second key input Quad is connected to the output of the first key, the second input drive is connected to the output of the Gating device.

In Fig. 2 presents a functional diagram of the device for transmission of start-stop messages.

Device for receiving start-stop message contains serially connected receiver 1, a frequency discriminator 2, filter 3, the threshold device 4, differential clock 9, crucial device 10, the first key 11, a storage device 12 and the second key 13, connected in series, the Quad splitter 14, a memory 15 and strobing threshold device 16, and the pulse counter 17, and the second input of the Gating device 8 is connected to the output of the filter 3, and its output connected to the second input of the drive 15, the second output of the pulse shaper 7 is connected with the second input of the circuit breaker 6, managing first input key 11 and the first input clock 9, the output of which is connected to the input of the pulse counter 17 and a second input of the storage device 12, signal input of a casting device 10 is connected to the output of the frequency discriminator 2, the output of the first key 11 is connected to the input of the Quad 14, the output strobing threshold device 16 is connected to the control input of the second key 13, and the output of the pulse counter 17 is connected with the second input clock 9, the controlling input of the drive 15 and the input strobing threshold device 16; the output of the second key 13 is an output device.

The pulse shaper 7 (Fig. 1) is a one-shot (see, for example, books Gutnikov B. C. "Integrated electronics in measurement is 11).

The pulse shaper 7 in Fig. 2 contains the second additional one-shot, whose input is connected to the input of the first one-shot, and the output is the second output of the pulse shaper.

Device for receiving start-stop message is as follows.

The received signal consisting of a clock duration Tst, manipulated the frequency of the S-element Barker code / S = 7/ length of each element T, and n /n = 1 to 103/ information frequency-shift keyed elements of the same duration, after filtering in the receiver 1 and the frequency detection unit 2 (Fig. 3A) is fed to the input of the filter 3, which is coherent with the drive signal Barker, and then to the input of the threshold device 4 (Fig. 3b). If the signal level exceeds the last threshold, the time corresponding to its maximum value of Vm(in the absence of interference in the end of the clock), the output unit 5 generates a negative pulse (Fig. 3b), which, after passing through the interrupter 6, creates at the same time a short pulse duration ( T) of the first output unit PHI 7 (Fig. 3G) and the pulse duration nT+ second it o the AI, and the first key 11 is closed; unit 8 generates a voltage pulse with an amplitude equal to the maximum value of the output signal of the filter 3 (Fig. 3E), the value of which is stored in the memory 15, and the output unit 9 is delayed by a time interval T with respect to the leading edge of the impulse acting on the second output unit PHI 7, is formed of n pulse duration with a period equal to T (Fig. G). In the device 10 decisions on the n information symbols and the output signals of one or another polarity are stored in the clocked pulses GTI 9 block 12. The same signals after the quadratic transformation Quad 14 sequentially in time are summed voltage in the block 15 and added to the already existing there (voltage equal to the amplitude of the output pulse unit 8). If the total signal memory 15 at the end of the last n-th pulse generator 9 (Fig. 3i) exceeds the threshold device 16, the output of the latter is formed by a pulse of duration nT+, which opens the second key 13, and the output of the generator 9 are n clock pulses (Fig. 3K), the read information symbols from the memory 12 through the key 13 to the output of the device (Fig. 2l). This time is determined by the pulse of false positives.

For example, if the device is a prototype of the probability of false positives is equal to 10-2- 10-6in the proposed device when the value of S = 7 and n = 12, 10-21. This is achieved by introducing a second measuring channel, in which the accumulation of stresses generated by the clock and information signals after non-linear processing, and comparison of the total signal level with a threshold, significantly exceeding the threshold of the threshold device 4. For n = 24 the probability of false positives is of the order of 10-50. The almost complete absence of false positives with the introduction of the second measuring channel has allowed optimal joint detection and measurement of the delay of the received signal to produce a first threshold is exceeded, the total signal.

The pickup device start-stop messages containing the receiver, the pulse counter, the gate device and the generator of clock pulses, characterized in that it introduced advanced to the second output of the pulse shaper and the second generator input clock pulses, connected in series, a frequency discriminator connected to the input with the output of the receiver filter, threshold devices who spent the first output with the first input of the Gating device, and the second output with the second inputs of the circuit breaker and the generator of clock pulses, and the second input of the Gating device connected to the output of the filter, connected in series solver, a first input connected to the output of the frequency discriminator, the first key is connected to a second input to the second output of the pulse shaper, a storage device that is connected to a second input with the output clock pulses, and a second key, a squarer connected in series, the input of which is connected to the output of the first key, the drive is connected to a second input with the output of the Gating device, and strobing the threshold device is connected to the output with the control input of the second key, moreover, the input of the pulse counter connected to the oscillator output clock pulses and the output to the first input clock pulses to the second input strobing threshold device and to the third input buffer, the output of the generator of clock pulses is connected to a second input of a casting device.

 

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